Sources: As2
- SLC to Eduard Potzl, 23 May 1899 · Vienna, Austria · UCCL12597 As2
- SLC to Johann Strauss, 25 May 1899 · Vienna, Austria · UCCL05597 As2
- SLC to Adele H. Strauss, 6 June 1899 · Broadstairs, England · UCCL05635 As2
- SLC per Olivia L. (Livy) Langdon to Gustave Grube, Unknown date · Unknown place · UCCL09045 As2
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